General rule of thumb is hit it until you want to pass it. Granted, living with roommates, we know the general accepted amount, but I dont care if you hit the J 3 times, im not gonna spaz on you... whatever. Just dont be a dick, and everything is ok.

On blunts though, if you didnt have that fucker in your hand/mouth for at least a minute or two, then you arent done with it. Thats just how we smoke blunts, they are for when you just want to laze back and get fucking stoned like a champ. You pass it when you are done with it for the next few minutes.